package com.hmdp.utils;

import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

@Component
public class RedisIdWorker {

    /**
     * 开始时间戳
     */
    private static final long BEGIN_TIMESTAMP=1753488000;

    /**
     *
     * 序列号位数
     */
    private static final int COUNT_BITS=32;

    @Resource
    private StringRedisTemplate stringRedisTemplate;
    public long nextId(String keyPrefix){
        //1.生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long nowSecond = now.toEpochSecond(ZoneOffset.UTC);
        long timestamp = nowSecond - BEGIN_TIMESTAMP;
        //2.生成序列号
        //2.1获取当前日期精确到天
        String date = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        //2.2.自增
        Long count = stringRedisTemplate.opsForValue().increment("icr" + keyPrefix + ":" + date);//方便统计而且避免数额过大不能固定死，
        // 而且序列号是32位的long是64，long顶得住序列号顶不住
        //3.拼接返回
        return timestamp << COUNT_BITS | count ;
    }


    public static void main(String[] args) {
        LocalDateTime time = LocalDateTime.of(2025,7,26,0,0,0);
        long second = time.toEpochSecond(ZoneOffset.UTC);
        System.out.println("second" + second);
    }
}